package com.neusoft.databus.common.utils;

import java.math.BigInteger;

/**
 * description
 *
 * @author sunchf
 * @date 2019年1月7日 下午3:52:25
 */
public class DigitalUtils {

    public static int bytesToUShort(byte[] data, int offset) {
        if (data.length < 2) {
            return ((data[offset] & 0xFF));
        }
        return new Integer(((data[offset] & 0xff) << 8) | (data[offset + 1] & 0xff));
    }

    public static int bytesToUShortSwapped(byte[] data, int offset) {
        return new Integer(((data[offset + 1] & 0xff) << 8) | (data[offset] & 0xff));
    }

    public static int bytesToShort(byte[] data, int offset) {
        return new Short((short) (((data[offset] & 0xff) << 8) | (data[offset + 1] & 0xff)));
    }

    public static int bytesToShortSwapped(byte[] data, int offset) {
        return new Short((short) (((data[offset + 1] & 0xff) << 8) | (data[offset] & 0xff)));
    }

    public static long bytesToUInt(byte[] data, int offset) {
        return new Long(((long) ((data[offset] & 0xff)) << 24) | ((long) ((data[offset + 1] & 0xff)) << 16)
                | ((long) ((data[offset + 2] & 0xff)) << 8) | ((data[offset + 3] & 0xff)));
    }

    public static long bytesToUIntSwapped(byte[] data, int offset) {
        return new Long(((long) ((data[offset + 2] & 0xff)) << 24) | ((long) ((data[offset + 3] & 0xff)) << 16)
                | ((long) ((data[offset] & 0xff)) << 8) | ((data[offset + 1] & 0xff)));
    }

    public static long bytesToUIntSwappedSwapped(byte[] data, int offset) {
        return new Long(((long) ((data[offset + 3] & 0xff)) << 24) | (((data[offset + 2] & 0xff) << 16))
                | ((long) ((data[offset + 1] & 0xff)) << 8) | (data[offset] & 0xff));
    }

    public static int bytesToInt(byte[] data, int offset) {
        return new Integer(((data[offset] & 0xff) << 24) | ((data[offset + 1] & 0xff) << 16)
                | ((data[offset + 2] & 0xff) << 8) | (data[offset + 3] & 0xff));
    }

    public static int bytesToIntSwapped(byte[] data, int offset) {
        return new Integer(((data[offset + 2] & 0xff) << 24) | ((data[offset + 3] & 0xff) << 16)
                | ((data[offset] & 0xff) << 8) | (data[offset + 1] & 0xff));
    }

    public static int bytesToIntSwappedSwapped(byte[] data, int offset) {
        return new Integer(((data[offset + 3] & 0xff) << 24) | ((data[offset + 2] & 0xff) << 16)
                | ((data[offset + 1] & 0xff) << 8) | ((data[offset] & 0xff)));
    }

    public static float bytesToFloat(byte[] data, int offset) {
        return Float.intBitsToFloat(((data[offset] & 0xff) << 24) | ((data[offset + 1] & 0xff) << 16)
                | ((data[offset + 2] & 0xff) << 8) | (data[offset + 3] & 0xff));
    }

    public static float bytesToFloatSwapped(byte[] data, int offset) {
        return Float.intBitsToFloat(((data[offset + 2] & 0xff) << 24) | ((data[offset + 3] & 0xff) << 16)
                | ((data[offset] & 0xff) << 8) | (data[offset + 1] & 0xff));
    }

    public static BigInteger bytesToULong(byte[] data, int offset) {
        final byte[] b9 = new byte[9];
        System.arraycopy(data, offset, b9, 1, 8);
        return new BigInteger(b9);
    }

    public static BigInteger bytesToULongSwapped(byte[] data, int offset) {
        final byte[] b9_1 = new byte[9];
        b9_1[1] = data[offset + 6];
        b9_1[2] = data[offset + 7];
        b9_1[3] = data[offset + 4];
        b9_1[4] = data[offset + 5];
        b9_1[5] = data[offset + 2];
        b9_1[6] = data[offset + 3];
        b9_1[7] = data[offset];
        b9_1[8] = data[offset + 1];
        return new BigInteger(b9_1);
    }

    public static long bytesToLong(byte[] data, int offset) {
        return new Long(((long) ((data[offset] & 0xff)) << 56) | ((long) ((data[offset + 1] & 0xff)) << 48)
                | ((long) ((data[offset + 2] & 0xff)) << 40) | ((long) ((data[offset + 3] & 0xff)) << 32)
                | ((long) ((data[offset + 4] & 0xff)) << 24) | ((long) ((data[offset + 5] & 0xff)) << 16)
                | ((long) ((data[offset + 6] & 0xff)) << 8) | ((data[offset + 7] & 0xff)));
    }

    public static long bytesToLongSwapped(byte[] data, int offset) {
        return new Long(((long) ((data[offset + 6] & 0xff)) << 56) | ((long) ((data[offset + 7] & 0xff)) << 48)
                | ((long) ((data[offset + 4] & 0xff)) << 40) | ((long) ((data[offset + 5] & 0xff)) << 32)
                | ((long) ((data[offset + 2] & 0xff)) << 24) | ((long) ((data[offset + 3] & 0xff)) << 16)
                | ((long) ((data[offset] & 0xff)) << 8) | ((data[offset + 1] & 0xff)));
    }

    public static double bytesToDouble(byte[] data, int offset) {
        return Double.longBitsToDouble(((long) ((data[offset] & 0xff)) << 56)
                | ((long) ((data[offset + 1] & 0xff)) << 48) | ((long) ((data[offset + 2] & 0xff)) << 40)
                | ((long) ((data[offset + 3] & 0xff)) << 32) | ((long) ((data[offset + 4] & 0xff)) << 24)
                | ((long) ((data[offset + 5] & 0xff)) << 16) | ((long) ((data[offset + 6] & 0xff)) << 8)
                | ((data[offset + 7] & 0xff)));
    }

    public static double bytesToDoubleSwapped(byte[] data, int offset) {
        return Double.longBitsToDouble(((long) ((data[offset + 6] & 0xff)) << 56)
                | ((long) ((data[offset + 7] & 0xff)) << 48) | ((long) ((data[offset + 4] & 0xff)) << 40)
                | ((long) ((data[offset + 5] & 0xff)) << 32) | ((long) ((data[offset + 2] & 0xff)) << 24)
                | ((long) ((data[offset + 3] & 0xff)) << 16) | ((long) ((data[offset] & 0xff)) << 8)
                | ((data[offset + 1] & 0xff)));
    }

    public static String bytesToHexString(byte[] src) {
        final StringBuilder stringBuilder = new StringBuilder();
        if ((src == null) || (src.length <= 0)) {
            return null;
        }
        for (final byte element : src) {
            final int v = element & 0xFF;
            final String hv = Integer.toHexString(v).toUpperCase();
            if (hv.length() < 2) {
                stringBuilder.append(0);
            }
            stringBuilder.append(hv);
        }
        return stringBuilder.toString();
    }

    public static byte[] hexStringToBytes(String hex) {
        final int strLen = hex.length();
        final int len = (strLen % 2) == 0 ? (strLen / 2) : ((strLen / 2) + 1);
        final byte[] intArray = new byte[len];
        try {
            for (int i = 0; i < len; i++) {
                if (i < (len - 1)) {
                    intArray[i] = (byte) Integer.parseInt(hex.substring(i * 2, (i * 2) + 2), 16);
                } else {
                    intArray[i] = (byte) Integer.parseInt(hex.substring(i * 2, strLen), 16);
                }
            }
        } catch (final NumberFormatException e) {
            e.printStackTrace();
        }
        return intArray;
    }

    public static String asciiToHex(String str) {
        final StringBuilder sb = new StringBuilder();
        final byte[] bs = str.getBytes();
        for (final byte element : bs) {
            sb.append(Integer.toHexString(element));
        }
        return sb.toString();
    }

    public static String hexToAscii(String hex) {

        final StringBuilder sb = new StringBuilder();
        for (int i = 0; i < (hex.length() - 1); i += 2) {
            final String output = hex.substring(i, (i + 2));
            final int decimal = Integer.parseInt(output, 16);
            sb.append((char) decimal);
        }
        return sb.toString();
    }

    static short[] crc16_tab_h = {0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1,
            0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
            0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1,
            0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
            0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0,
            0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
            0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1,
            0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40,
            0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1,
            0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
            0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1,
            0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
            0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1,
            0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
            0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40 };

    static short[] crc16_tab_l = {0x00, 0xC0, 0xC1, 0x01, 0xC3, 0x03, 0x02, 0xC2, 0xC6, 0x06, 0x07, 0xC7, 0x05, 0xC5,
            0xC4, 0x04, 0xCC, 0x0C, 0x0D, 0xCD, 0x0F, 0xCF, 0xCE, 0x0E, 0x0A, 0xCA, 0xCB, 0x0B, 0xC9, 0x09, 0x08, 0xC8,
            0xD8, 0x18, 0x19, 0xD9, 0x1B, 0xDB, 0xDA, 0x1A, 0x1E, 0xDE, 0xDF, 0x1F, 0xDD, 0x1D, 0x1C, 0xDC, 0x14, 0xD4,
            0xD5, 0x15, 0xD7, 0x17, 0x16, 0xD6, 0xD2, 0x12, 0x13, 0xD3, 0x11, 0xD1, 0xD0, 0x10, 0xF0, 0x30, 0x31, 0xF1,
            0x33, 0xF3, 0xF2, 0x32, 0x36, 0xF6, 0xF7, 0x37, 0xF5, 0x35, 0x34, 0xF4, 0x3C, 0xFC, 0xFD, 0x3D, 0xFF, 0x3F,
            0x3E, 0xFE, 0xFA, 0x3A, 0x3B, 0xFB, 0x39, 0xF9, 0xF8, 0x38, 0x28, 0xE8, 0xE9, 0x29, 0xEB, 0x2B, 0x2A, 0xEA,
            0xEE, 0x2E, 0x2F, 0xEF, 0x2D, 0xED, 0xEC, 0x2C, 0xE4, 0x24, 0x25, 0xE5, 0x27, 0xE7, 0xE6, 0x26, 0x22, 0xE2,
            0xE3, 0x23, 0xE1, 0x21, 0x20, 0xE0, 0xA0, 0x60, 0x61, 0xA1, 0x63, 0xA3, 0xA2, 0x62, 0x66, 0xA6, 0xA7, 0x67,
            0xA5, 0x65, 0x64, 0xA4, 0x6C, 0xAC, 0xAD, 0x6D, 0xAF, 0x6F, 0x6E, 0xAE, 0xAA, 0x6A, 0x6B, 0xAB, 0x69, 0xA9,
            0xA8, 0x68, 0x78, 0xB8, 0xB9, 0x79, 0xBB, 0x7B, 0x7A, 0xBA, 0xBE, 0x7E, 0x7F, 0xBF, 0x7D, 0xBD, 0xBC, 0x7C,
            0xB4, 0x74, 0x75, 0xB5, 0x77, 0xB7, 0xB6, 0x76, 0x72, 0xB2, 0xB3, 0x73, 0xB1, 0x71, 0x70, 0xB0, 0x50, 0x90,
            0x91, 0x51, 0x93, 0x53, 0x52, 0x92, 0x96, 0x56, 0x57, 0x97, 0x55, 0x95, 0x94, 0x54, 0x9C, 0x5C, 0x5D, 0x9D,
            0x5F, 0x9F, 0x9E, 0x5E, 0x5A, 0x9A, 0x9B, 0x5B, 0x99, 0x59, 0x58, 0x98, 0x88, 0x48, 0x49, 0x89, 0x4B, 0x8B,
            0x8A, 0x4A, 0x4E, 0x8E, 0x8F, 0x4F, 0x8D, 0x4D, 0x4C, 0x8C, 0x44, 0x84, 0x85, 0x45, 0x87, 0x47, 0x46, 0x86,
            0x82, 0x42, 0x43, 0x83, 0x41, 0x81, 0x80, 0x40 };

    public static String crc16(byte[] data) {
        final int preval = 0xffff;

        int ucCRCHi = (preval & 0xff00) >> 8;
        int ucCRCLo = preval & 0x00ff;
        int iIndex;
        for (final byte element : data) {
            iIndex = (ucCRCLo ^ element) & 0x00ff;
            ucCRCLo = ucCRCHi ^ DigitalUtils.crc16_tab_h[iIndex];
            ucCRCHi = DigitalUtils.crc16_tab_l[iIndex];
        }
        final int crc = ucCRCHi | (ucCRCLo << 8);

        return String.format("%04x", crc);
    }

    public static String lrc(String str) {
        int chksum = 0;
        for (int i = 0; i < (str.length() / 2); i++) {
            final String eachHex = str.substring(2 * i, (2 * i) + 2);
            chksum = chksum + Integer.parseInt(eachHex, 16);
        }
        int remainder = chksum & 0xFF;
        remainder ^= 0xFF;
        int sum = remainder + 1;
        sum &= 0xFF;
        String lrc_hex = Integer.toHexString(sum);
        if (lrc_hex.length() == 1) {
            lrc_hex = "0" + lrc_hex;
        }
        return str + lrc_hex.toUpperCase();
    }

    public static void main(String[] args) {
        System.out.println(DigitalUtils.crc16(DigitalUtils.hexStringToBytes("010300000002")));
    }

}
